--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/assert.js	Fri Dec 21 16:36:24 2012 -0400
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * This is not a test - but a framework to run other tests.
+ *
+ * @subtest
+ */
+
+// Assert is TestNG's Assert class
+Object.defineProperty(this, "Assert", { 
+    configuable: true,
+    enumerable: false,
+    writable: true,
+    value: Packages.org.testng.Assert
+});
+
+// fail function to call TestNG Assert.fail
+Object.defineProperty(this, "fail", {
+    configuable: true,
+    enumerable: false,
+    writable: true,
+    // 'error' is optional. if present it has to be 
+    // an ECMAScript Error object or java Throwable object
+    value: function (message, error) {
+        var throwable = null;
+        if (typeof error != 'undefined') {
+            if (error instanceof java.lang.Throwable) {
+                throwable = error;
+            } else if (error.nashornException instanceof java.lang.Throwable) {
+                throwable = error.nashornException;
+            }
+        }
+
+        if (throwable != null) {
+            // call the fail version that accepts Throwable argument
+            Assert.fail(message, throwable);
+        } else {
+            // call the fail version that accepts just message
+            Assert.fail(message);
+        }
+    }
+});